leafy vegetable plant brassica species tatsoi plant Tatsoi (*Brassica narinosa* or *Brassica rapa* var. *rosularis*), also called Spinach mustard, Spoon mustard, or Rosette bok choy, is an Asian variety of *Brassica rapa* grown for greens. This plant has become popular in North American cuisine as well, and is now grown throughout the world. WIKIPEDIA:Tatsoi brassica narinosa brassica rapa var. rosularis spinach mustard spoon mustard requires discussion